Battery cell, battery, and electrical device

Abstract

A battery cell includes a shell, an electrode assembly, an end cover assembly, a support member, and a terminal assembly; the shell has an opening; the electrode assembly is accommodated in the shell; the end cover assembly is closed to the opening; the support member is disposed between the end cover assembly and a main body of the electrode assembly; at least a portion of the terminal assembly extends between the end cover assembly and the support member, and the terminal assembly is conductively connected to a tab of the electrode assembly; a first accommodating portion is disposed on a first surface, facing the end cover assembly, of the support member, and the first accommodating portion is configured to accommodate at least a portion of the terminal assembly.

1 . A battery cell, comprising:
 a shell, having an opening;   an electrode assembly, comprising a main body and a tab protruding from the main body, wherein the electrode assembly is accommodated in the shell;   an end cover assembly, covering the opening;   a support member, located in the shell and disposed between the end cover assembly and the main body; and   a terminal assembly, at least partially extending between the end cover assembly and the support member, wherein the terminal assembly is conductively connected to the tab;   wherein the support member has a first surface facing the end cover assembly, the first surface is provided with a first accommodating portion, and the first accommodating portion is configured to accommodate at least a portion of the terminal assembly.   
     
     
         2 . The battery cell according to  claim 1 , wherein the support member is provided with a first reinforcing portion, and the first reinforcing portion is disposed in the first accommodating portion. 
     
     
         3 . The battery cell according to  claim 2 , wherein the first reinforcing portion comprises a first portion and a second portion, the terminal assembly comprises a current collecting member extending between the end cover assembly and the support member, wherein in a thickness direction of the end cover assembly, a projection of the first portion on the support member does not overlap with that of the current collecting member on the support member, and the second portion is located between the current collecting member and a bottom surface of the first accommodating portion. 
     
     
         4 . The battery cell according to  claim 3 , wherein in the thickness direction of the end cover assembly, a surface of the first portion facing the end cover assembly is closer to the first surface than a surface of the second portion facing the end cover assembly. 
     
     
         5 . The battery cell according to  claim 2 , wherein the terminal assembly comprises a current collecting member extending between the end cover assembly and the support member, and a projection of the current collecting member on the support member does not overlap with that of the first reinforcing portion on the support member in the thickness direction of the end cover assembly. 
     
     
         6 . The battery cell according to  claim 5 , wherein the first accommodating portion comprises a first accommodating region and a second accommodating region communicated with each other, a depth of the first accommodating region is greater than that of the second accommodating region in the thickness direction of the end cover assembly, the current collecting member is accommodated in the first accommodating region, and the first reinforcing portion is located in the second accommodating region. 
     
     
         7 . The battery cell according to  claim 1 , wherein the support member is provided with a first protrusion, and the first protrusion protrudes in a direction towards the end cover assembly from the first surface. 
     
     
         8 . The battery cell according to  claim 7 , wherein in the thickness direction of the end cover assembly, the first protrusion is spaced from the end cover assembly. 
     
     
         9 . The battery cell according to  claim 7 , wherein the first protrusion is disposed at one end of the support member in a first direction, and the first accommodating portion extends to the first protrusion, wherein the first direction is perpendicular to the thickness direction of the end cover assembly. 
     
     
         10 . The battery cell according to  claim 9 , wherein in the first direction, the first protrusions are disposed at both ends of the support member. 
     
     
         11 . The battery cell according to  claim 7 , wherein the first protrusion is provided with an avoidance gap for avoiding extension of the terminal assembly to a portion between the support member and the end cover. 
     
     
         12 . The battery cell according to  claim 1 , wherein the support member is connected to the end cover assembly, so as to fix the support member to the end cover assembly. 
     
     
         13 . The battery cell according to  claim 12 , wherein the support member is connected to the end cover assembly by hot melting, laser welding, or ultrasonic welding, or the support member is bonded with the end cover assembly by a bonding member. 
     
     
         14 . The battery cell according to  claim 12 , wherein a first connecting portion is disposed on at least one end of the support member in the first direction;
 the end cover assembly has a second connecting portion, the second connecting portion is in one-to-one correspondence with the first connecting portion, the second connecting portion is opposite to the support member in the first direction, and the first direction is perpendicular to the thickness direction of the end cover assembly; and   the first connecting portion abuts against the second connecting portion in the thickness direction of the end cover assembly.   
     
     
         15 . The battery cell according to  claim 14 , wherein in the thickness direction of the end cover assembly, the second connecting portion has a second surface facing the main body, the second surface is provided with a second accommodating portion, and the second accommodating portion is configured for accommodating the first connecting portion; and
 wherein in the thickness direction of the end cover assembly, the first connecting portion has a third surface facing the main body, and a distance between the second surface and the third surface is H, which satisfies H≤2 mm;   and wherein the second surface and the third surface are coplanar.   
     
     
         16 . The battery cell according to  claim 14 , wherein the first connecting portion is provided with a second reinforcing portion, and the second reinforcing portion is connected to one end of the support member in the first direction;
 wherein in the thickness direction of the end cover assembly, the second reinforcing portion is disposed on a fourth surface of the first connecting portion facing the end cover assembly, and the second reinforcing portion is configured for abutting against the second connecting portion;   wherein the fourth surface is further provided with a fusion portion, and the fusion portion is configured for connecting the first connecting portion and the second connecting portion after melting;   wherein the fourth surface is further provided with a plurality of the fusion portions, one part of the fusion portions are located on one side of the second reinforcing portion in a second direction, the other part of the fusion portions are located on the other side of the second reinforcing portion in the second direction, and the first direction, the thickness direction of the end cover assembly, and the second direction are perpendicular to each other; and   wherein the fusion portion protrudes from the fourth surface.   
     
     
         17 . The battery cell according to  claim 1 , wherein the support member is configured for supporting the main body. 
     
     
         18 . The battery cell according to  claim 1 , wherein the tab is bent around a first edge of the support member, and the first edge is an edge of the support member in its width direction; and
 wherein the support member has a fifth surface facing the main body and abutting against the main body in the thickness direction of the end cover assembly, the fifth surface comprises a support portion and two edge portions, the two edge portions are connected to two sides of the support portion respectively in a width direction of the support member, and the edge portions tilt in a direction towards the end cover assembly gradually from the support portion.   
     
     
         19 . A battery, comprising:
 a box; and   the battery cell according to  claim 1 , wherein the battery cell is accommodated in the box.   
     
     
         20 . An electrical device, comprising the battery according to  claim 19 .